Move → To Class Protocol (Make Class Method) creates multiple undo items

[Jan Vrany]

Steps to reproduce:

1. Create class. in the class create two methods say foo and bar.
2. Select both methods.
3. Choose Selector → Move → To Class Protocol (Make Class Method)

This creates two entries in undo list (check Operations → Undo Recent)
As all methods was moved by one command (click), only one (compound) undo
item should be created.